dunnyyoudaoicibaDictYouDict[dunny 词源字典]
"An underground passage or cellar, especially in a tenement", Early 19th century (in the sense 'dung'): from dialect dunnekin 'privy', probably from dung + archaic slang ken 'house'. sense 1 is perhaps a different word.[dunny etymology, dunny origin, 英语词源]